What Brother Meredith, Citizen Sade, and ManicMan said. I used to hold surveys on basing, but I've come to the conclusion that a. people will use what they have, and b. the answers were pretty consistent. Just a simple black base will do. Best not to weld the thing to it with precious, precious green stuff. Something that can be removed easily if the winner wants to rebase them, but which should serve as a good starting point.